If you have the new Samsung phones and want to use DeX app, you can now use it. The app is now available for Windows 7 and 10 and Mac systems. You can now connect your Galaxy phone to your computer, helping turn your smartphone into a computer. Aside from being able to play games, access local files for a presentation, DeX makes it possible for you to use your computer's keyboard and mouse to control your Galaxy smartphone. There are also apps that are optimized to provide you with a good experience on Samsung DeX, including Microsoft Office, YouTube, Adobe Premiere Rush, and Twitch.
Source: PocketNow